Whats the Difference between the z5500 and the z680

I've been looking at these two diffent pairs of speakers, they have the exact same specs. So why would i spend more to get the z5500?



And would the z680's be an upgrade from my klipsch 5.1 promedia ultra?

thanks mike

Do you have the link to the z680 one? I'm curious since I can't find it at newegg

http://www.hothardware.com/Articles/...peaker_System/



they r and older speaker